[libvirt PATCH v2 66/81] qemu: Implement VIR_MIGRATE_POSTCOPY_RESUME for Prepare phase

[Jiri Denemark]

On Wed, Jun 01, 2022 at 14:50:06 +0200, Jiri Denemark wrote:
> The QEMU process is already running, all we need to do is to call
> migrate-recover QMP command. Except for some checks and cookie handling,
> of course.
> 
> Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
> Reviewed-by: Peter Krempa <pkrempa at redhat.com>
> Reviewed-by: Pavel Hrdina <phrdina at redhat.com>
> ---
> 
> Notes:
>     Version 2:
>     - no change
> 
>  src/qemu/qemu_migration.c | 99 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 99 insertions(+)

And the following diff is needed to make sure the Finish phase sees the
original name of the domain in case it was renamed during migration (via
--dname ... option).

Jirka

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 22a80d8430..506b6cde7a 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -3534,6 +3534,8 @@ qemuMigrationDstPrepareResume(virQEMUDriver *driver,
                                          QEMU_MIGRATION_COOKIE_CAPS)))
         goto cleanup;

+    priv->origname = g_strdup(origname);
+
     if (!(incoming = qemuMigrationDstPrepare(vm, false, protocol,
                                              listenAddress, port, -1)))
         goto cleanup;
@@ -3561,8 +3563,10 @@ qemuMigrationDstPrepareResume(virQEMUDriver *driver,

  cleanup:
     qemuProcessIncomingDefFree(incoming);
-    if (ret < 0)
+    if (ret < 0) {
+        VIR_FREE(priv->origname);
         ignore_value(qemuMigrationJobSetPhase(vm, QEMU_MIGRATION_PHASE_POSTCOPY_FAILED));
+    }
     qemuDomainCleanupAdd(vm, qemuProcessCleanupMigrationJob);
     qemuMigrationJobContinue(vm);
     virDomainObjEndAPI(&vm);